Results: There was a predominance of the Chagas' disease in the Central-west region, in the initial implants. In reoperations, the population with Chagas' disease represented the majority in the Southeast, too. Mean age was 59.3 ± 15.3 and 58.6 ± 14.8, respectively for initial implants and reoperations in Chagas' disease patients and 73.5 ± 12.6 and 73.7 ± 13.5, in non-Chagas' disease patients. There was no difference in respect to both genders and etiology. Syncope episodes and 3rd degree A-V blocks with wide QRS were more frequent in patients with Chagas' disease, and dizziness, heart failure and 3rd degree A-V blocks with in the other patients. Ventricular pacing systems were used in 60% and 63% in the initial implants and 77% and 76% of the reoperations, respectively for Chagas' and non-Chagas' disease patients. The need to change the batteries was the main reason for reoperations in 76.1% and 79.6% of these procedures, respectively for patients with Chagas' disease and the other causes of bradicardia.Conclusions: The analysis of data of these two populations demonstrated significant differences in the clinical and demographic characteristics.
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